I have a Farmall H with a generator on it that is putting out 12v. Will I be able to put an 8v battery on it and be okay?
 
A 12 volt battery should in fact cost a good bit less then an 8 volt battery. Plus when was the last time you had a battery charger that would put out 8 volts. Oh and by the way if you ran it with that set up you would be boiling the battery dry so simple answer is yes it would run and all but the battery would be getting over charged and not last very long and as I said a 12 volt battery is cheaper any how
 
(quoted from post at 10:31:07 07/12/10) I have a Farmall H with a generator on it that is putting out 12v. Will I be able to put an 8v battery on it and be okay?
generator with a cut out, right?
Just because you measured 12v doesn't mean you have a 12v generator. The old un-regulated 3 brush generators will put out up around 18 volts no load, but running then like that will over time burn up the field coils due to the high current resulting from the well over 7 volts they normally live on.
 
12v will not charge a 12v battery.
If you have the 8v battery, hook it up (proper polarity as determined by the voltage it now makes) and see what the charging voltage is with a battery installed. It will take ~10 volts to charge that battery. If it charges at 9 it might do Ok. If it charges at 11 or 12 it will boil the battery. If it is a three brush gen and is charging too low, move the brush closer to the stationary brush. If too high move it farther away. Jim
 
He didn't say he had a 12v gen , he said it was putting out 12v. Lot of diff. Set it up w/ 6v like it is supposed to be and just make sure EVERYTHING is up to snuff. (cable dia , grounds nice and clean etc,etc) and that is all you will ever need to start and run that ole "H" even w/ the lites on. 12v is a good bandaid for shoddy electric system.
 
The 8 voltbatteries and the later 6/12 combos were NEVER ANY GOOD from day 1 but a lot of people did put money and time trying to make them work. If you have the money to spend on an 8 volt you have the money and time to spend trying to make an 8 volt work you can afford to fix the cables and connections to make the 6 volt work although I would go with the 12 volt conversion as that is what I have done on my tractors and I have never regreted it. Good luck on whichever way you go! Armand
 

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